Apparatus

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sensors Mode-S transponder

4CA9BB

ICAO 24-bit transponder address · allocated to Ireland

Currently assigned to EI-LRB · AIRBUS A-321neo

Hex
4CA9BB
Octal
23124673
Decimal
5,024,187
Country
IE
Tail
EI-LRB
Type
A21N
No current signal · last broadcast 1h ago
Flights observed
313
Distinct callsigns
20
Country
IE
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S 4CA9BB.

Country allocation

The ICAO 24-bit address 4CA9BB falls within the block assigned to Ireland (IE) by ICAO Annex 10, Volume III. Every aircraft registered in Ireland receives a permanent address from this block at the time of registration; the address stays with the airframe even if the aircraft is re-registered to a different operator within the country.

Callsign history 20 distinct

Callsign Airline Flights Last seen
EIN1LH - 22 2026-07-06
EIN1EA - 19 2026-07-07
EIN1YL - 16 2026-07-02
EIN1AC Aer Lingus 16 2026-07-02
EIN1TC - 15 2026-07-05
EIN10M - 15 2026-07-05
EIN52X - 14 2026-07-12
EIN52A - 13 2026-07-12
EIN38A - 13 2026-07-01
EIN1PR - 13 2026-07-11
EIN13X - 13 2026-07-11
EIN381 - 12 2026-07-01
EIN3KM - 7 2026-07-06
EIN3GM - 7 2026-07-06
EIN138 - 7 2026-07-09
EIN11T - 7 2026-07-09
EIN11P - 7 2026-07-09
EIN9AR Aer Lingus 6 2026-05-25
EIN1XL - 6 2026-07-12
EIN1XG - 6 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 EIN9EG - Jul 14, 00:15 UTCJul 14, 02:30 UTC2h 15m
2026-07-13 EIN9AF - Jul 13, 15:05 UTCJul 13, 22:05 UTC7h 0m
2026-07-13 EIN605P - Jul 13, 11:50 UTCJul 13, 13:00 UTC1h 10m
2026-07-13 EIN60T DUB → AMS Jul 13, 09:25 UTCJul 13, 10:35 UTC1h 10m
2026-07-13 EIN1XG PHL → DUB Jul 13, 00:55 UTCJul 13, 07:10 UTC6h 15m
2026-07-12 EIN1XL DUB → PHL Jul 12, 15:45 UTCJul 12, 22:35 UTC6h 50m
2026-07-12 EIN52X - Jul 12, 08:25 UTCJul 12, 09:50 UTC1h 25m
2026-07-12 EIN52A DUB → CDG Jul 12, 06:15 UTCJul 12, 07:25 UTC1h 10m
2026-07-11 EIN1PR - Jul 11, 21:55 UTCJul 12, 03:30 UTC5h 35m
2026-07-11 EIN13X DUB → BDL Jul 11, 13:30 UTCJul 11, 20:05 UTC6h 35m
2026-07-11 EIN1XG PHL → DUB Jul 11, 01:35 UTCJul 11, 07:50 UTC6h 15m
2026-07-10 EIN1XL DUB → PHL Jul 10, 15:45 UTCJul 10, 23:05 UTC7h 21m
2026-07-10 EIN525 - Jul 10, 11:40 UTCJul 10, 13:00 UTC1h 20m
2026-07-10 EIN524 DUB → CDG Jul 10, 08:55 UTCJul 10, 10:05 UTC1h 10m
2026-07-09 EIN11P - Jul 9, 23:45 UTCJul 10, 06:30 UTC6h 45m
2026-07-09 EIN11T - Jul 9, 11:50 UTCJul 9, 19:35 UTC7h 45m
2026-07-09 EIN138 BOS → DUB Jul 9, 03:40 UTCJul 9, 09:20 UTC5h 40m
2026-07-08 EIN145 - Jul 8, 09:55 UTCJul 8, 16:05 UTC6h 10m
2026-07-07 EIN1EA - Jul 7, 00:35 UTCJul 7, 06:05 UTC5h 30m
2026-07-06 EIN1LH - Jul 6, 15:15 UTCJul 6, 21:55 UTC6h 40m
2026-07-06 EIN994 - Jul 6, 13:25 UTCJul 6, 13:50 UTC25m
2026-07-06 EIN3GM MUC → DUB Jul 6, 09:45 UTCJul 6, 12:00 UTC2h 15m
2026-07-06 EIN3KM DUB → MUC Jul 6, 06:50 UTCJul 6, 08:40 UTC1h 50m
2026-07-05 EIN1TC EWR → DUB Jul 5, 22:25 UTCJul 6, 04:05 UTC5h 40m
2026-07-05 EIN10M DUB → EWR Jul 5, 13:00 UTCJul 5, 19:55 UTC6h 55m
2026-07-04 EIN11P IAD → DUB Jul 4, 21:00 UTCJul 5, 03:10 UTC6h 10m
2026-07-04 EIN11T - Jul 4, 11:45 UTCJul 4, 19:10 UTC7h 25m
2026-07-04 EIN138 BOS → DUB Jul 4, 04:00 UTCJul 4, 09:25 UTC5h 25m
2026-07-03 EIN145 - Jul 3, 10:00 UTCJul 3, 16:10 UTC6h 10m
2026-07-02 EIN1YL - Jul 2, 22:55 UTCJul 3, 04:05 UTC5h 10m
2026-07-02 EIN1AC SNN → BOS Jul 2, 12:55 UTCJul 2, 19:20 UTC6h 25m
2026-07-02 EIN909 - Jul 2, 09:35 UTCJul 2, 11:00 UTC1h 25m
2026-07-02 EIN9HR - Jul 2, 06:20 UTCJul 2, 07:35 UTC1h 15m
2026-07-01 EIN1YL - Jul 1, 22:30 UTCJul 2, 03:55 UTC5h 25m
2026-07-01 EIN1AC SNN → BOS Jul 1, 13:00 UTCJul 1, 19:30 UTC6h 30m
2026-07-01 EIN381 - Jul 1, 09:05 UTCJul 1, 10:05 UTC1h 0m
2026-07-01 EIN38A - Jul 1, 06:35 UTCJul 1, 07:40 UTC1h 5m
2026-06-30 EIN1EA - Jun 30, 22:35 UTCJul 1, 04:20 UTC5h 45m
2026-06-30 EIN1LH - Jun 30, 13:40 UTCJun 30, 20:20 UTC6h 40m
2026-06-30 EIN1EA - Jun 30, 01:04 UTCJun 30, 06:55 UTC5h 51m
2026-06-29 EIN1LH - Jun 29, 13:30 UTCJun 29, 19:54 UTC6h 25m
2026-06-29 EIN144 - Jun 29, 03:44 UTCJun 29, 09:10 UTC5h 25m
2026-06-28 EIN139 DUB → BOS Jun 28, 19:09 UTCJun 29, 01:39 UTC6h 30m
2026-06-28 EIN42C VCE → DUB Jun 28, 14:30 UTCJun 28, 16:45 UTC2h 15m
2026-06-28 EIN42M DUB → VCE Jun 28, 10:30 UTCJun 28, 12:50 UTC2h 20m
2026-06-27 EIN173 - Jun 27, 17:39 UTCJun 27, 18:35 UTC55m
2026-06-27 EIN172 DUB → LHR Jun 27, 15:45 UTCJun 27, 16:35 UTC50m
2026-06-27 EIN5WG BCN → DUB Jun 27, 09:55 UTCJun 27, 11:55 UTC2h 0m
2026-06-27 EIN5HJ DUB → BCN Jun 27, 06:09 UTCJun 27, 08:25 UTC2h 15m
2026-06-26 EIN179 - Jun 26, 20:04 UTCJun 26, 20:50 UTC45m

About Mode-S

A Mode-S transponder code (also called an "ICAO 24-bit address" or "hex code") is a 6-character hexadecimal identifier permanently assigned to an aircraft when it's first registered. Unlike callsigns (which change with each flight) or registrations (which can change if an aircraft is sold internationally), the Mode-S address stays with the airframe for the life of the aircraft in that country.

Every ADS-B transmission from an aircraft includes its Mode-S address, making it the most reliable way to identify a specific airframe. Flight-tracking services like Apparatus use the Mode-S address as the primary key for tying position broadcasts, callsigns, and ownership records together.

Prefer a tail-number view? See the EI-LRB page for operator, model, and routing details .

Mode-S 4CA9BB frequently asked

What is Mode-S code 4CA9BB?
4CA9BB is an ICAO 24-bit transponder address. Allocated to Ireland. Assigned to EI-LRB.
Where is Mode-S 4CA9BB registered?
Mode-S code 4CA9BB is allocated to Ireland (IE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4CA9BB broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4CA9BB, octal 23124673, decimal 5,024,187.
What flights does 4CA9BB operate?
Mode-S 4CA9BB has broadcast 20 distinct callsigns, including EIN1LH, EIN1EA, EIN1YL, EIN1AC, EIN1TC.